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“ADCATROL” Intermittent Blowdown Valves VPA 26 S (cast
steel)
DESCRIPTIONThe VPA26S blowdown valve was specially designed for
applicationon steam boilers removing the concentrations of solids
avoidingboiler damages, unstable water level control and other
typicalproblems.The valves are provided with a diaphragm actuator
suitable forcompressed air motive fluid.The opening signal is
supplied by an automatic intermittent controlunit or manually
(optional).Connections are flanged .
OPERATIONThe valve can be operated manually or using a pneumatic
actuator.Valve aperture depends from the boiler manufacturer
specification(example: once a day during five seconds).
MAIN FEATURESHigh quality hardened valve and seat.Manual or
automatic control.Can be locked in the open position if
suppliedwith the manual operation lever.
OPTIONS: Air filter regulatorSolenoid valve with cycling timer
.Mechanical limit switchWater powered actuatorStainless steel
construction.
USE: Intermittent blowdown of steamboilers.
AVAILABLEMODELS: VPA 26SVALVE SIZES: DN20 to DN50CONNECTIONS:
Flanged EN 1092-1ACTUATORS: PA-205; PA-280.ACTUATOR CONN: 1/4'’
NPT-F
HOW TO SELECT:Never size the valve according to the pipe
diameterin which it has to be fitted but according to therequired
actual flow of steam or water.Refer to valvecalculation data sheet
or consult the factory.
MAX. AIR/WATERSUPPLY PRESS.: 3,5 barAMBIENTTEMPERATURE: -20�C
...+70�CSTEM SEALING: Graphite - up to 400�CPLUG TYPES: On-Off
(PT)PORT: Full port
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abcde ADCA
VALSTEAM ADCA We reserve the right to change the design and
material of this product without notice.
IS VPA26S.10 E 04.07
www.valsteam.com
Press.bar
Temp. C°+Temp.C°-
Body
FluidDN/PN
www.valsteam.com
Press.bar
Temp. C°+Temp.C°-
Body
FluidDN/PN
VPA26S– with pneumatic actuator and manual operation
VPA26S– manual operation only
20 150 53 80 175 380 15 1225 160 58 85 175 380 16 1332 180 70 90
175 380 20 1740 200 75 95 175 650 25 2250 230 83 105 175 650 34
31
* Valve with pneumatic actuator** Valve with manual lever
only
D1 F * WGT. Kgs**WGT
KgsDN A B C
DIMENSIONS ( mm) - VALVE BODY
POS. DESIGNATION MATERIAL
1 Valve Body A216 WCB / 1.06192 Bonnet CF8 / 1.43083 * Actuator
Steel Fe410.1/St.Steel
3.1 * Spring Spring Steel4 * Diaphragm NBR 705 Yoke Carbon
Steel/St.Steel6 * Valve Plug Hardened St. Steel
6.1 * Valve Seat Hardened St. Steel7 Packing Graphite8 Valve
Lever Stainless steel / 1.4301
* Available spare parts.
MATERIALS
DN15-100 DA/RA DN125-200 DA
PA-205 210 235 N/APA-280 275 240 N/A
DIMENSIONS - ACTUATOR
D (mm)Type ø E (mm)
DN15 DN20 DN25 DN32 DN40 DN50
Stroke - 12 12 12 12 12
VALVE STROKE IN mm
SIZES
DN15 DN20 DN25 DN32 DN40 DN50
Kvs - 6 7,5 11 24 30
FLOW RATE COEFFICIENTS
SIZES
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abcde ADCA
VALSTEAM ADCA We reserve the right to change the design and
material of this product without notice.
IS VPA26S.10 E 04.07
ACTUATOR
(Pressure) DN15 DN20 DN25 DN32 DN40 DN50
PA-205
(0 - 1 bar)
PA-280
(0 - 1 bar)
3,5 bar
MIN. AIR PRESSURE
SIZES
— 25 25 25 25 15
MAX. PERMISSIBLE PRESS.DROP IN bar - Normally closed valve
(fluid to close) - Reverse action actuator (air signal to open)
— — — 253,5 bar — —
Important: The pressure drop values are referred to closed
valves. For valve sizes DN65 and above please consult. Special
spring drops available on request. The pressure drop values must be
used within the body rating limits.
TYPICAL INSTALLATION
1 VPA26S Blowdown Valve2 ADCA Digital Timer plus Connector3 ADCA
Solenoid Valve 3/24 ADCA P10 Air Filter Regulator5 Ball Valve6
Limit Switch
Pos. Designation
www.valsteam.com
Press.bar
Temp. C°+Temp.C°-
Body
FluidDN/PN
TESTVALVEPOWER
10
864
2
0 .2
24 6
8
1 00 .2
